On Chag or Shabbat, it is forbidden to fully create or remove a temporary
If one wishes to use a rain cover which will be raised at least one Tefach higher than the Schach, or which will be spread below the Schach, one must ensure that it is extended at least one Tefach across the width of the entire Sukkah (in addition to any space taken up by the actual roll) before Chag. This minimal amount must remain open for the entire duration of Chag and Shabbat.
A rain-cover which is designed like a hinged door may be used on Shabbat and Chag without restriction.
When removing the rain cover on Shabbat or Chag, one should ensure that any water remaining on it does not pour onto grass or earth (unless they are still absolutely saturated from the rain).
When using a rain cover of any type, one must ensure that the Schach is uncovered when it is laid out, as well as at the onset of Chag (i.e. from sunset until the emergence of three stars). One should also remember to open the cover whenever the Sukkah is being used.
On Chag or Shabbat, one may set up a temporary partition for shelter or privacy. One may not do so if it is required to validate the Sukkah, but one may ask a Non-Jew to do so. [This is most frequently an issue when the primary walls of the Sukkah are hinged or foldable.]
